a=furaje vaca
b=furaje oaie
a/3=furaje vitel
b/2=furaje miel
40a+30a/3+80b+40b/2=1200
4a+3a/3+8b+4b/2=120
24a+6a+48b+12b=720
30a+60b=720
a+2b=24 a=24-2b
20a+20b=360 a+b=18
24-2b+b=18
b=6 kg oaia
a=18-6=12 kg furaje vaca
a/3=12/3= 4 kg furaje vitelul
b/2=6/2=3 kg furaje mielul